I think it's best that the sensor is "dump" and only provides the actual reading of the distance value, which sends the measured value to a "master" then the master will decide. The "master" could have a configuration file that defines min/max values of the range, so the master can validate the measured value. Then the "master" can provide% just as you prefer/can write codes that shows the graph

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(yeah, this is really old in tech years, but I post in the event someone stumbles upon this.) I actually tried the GPS suggestion. I was wrong about the error between two identical GPS's. It's quite large. Check out the other suggestion first.

Now it is on github also : https://github.com/mysensors/MySensors/issues/1403
lwaga created this issue in mysensors/MySensors
open
MySensors GatewayW5100 example sketch do not compile with ATmega128 board
#1403

@mfalkvidd said in idea: allow the present function to indicate if an echo will be sent:
To my knowledge, the MySensors library itself will send an echo when requested. There is no need to present if the node supports echo or not, echo is always enabled.
Very interesting!